Abstract
The behavior of six uniaxial compression columns is investigated. Specimen featured an initial section of (120 x 200) mm2, a final section of (200 x 200) mm2 and height of 1.600 mm, strengthened on the tensile and compression sides with plaster or not. Adherence between new and old concrete, and cracking pattern was satisfactory. Although coated columns showed the same behavior to their respective non-coated ones even when concrete area was reduced by approximately 20%, problems consisted in the crushing of the reinforced concrete layer immediately prior to the rupture of the columns. This strengthening proved to be more adequate when undertaken at the columns´ compressed zone and may be executed through conventional procedures with or without mortar coating layer.
Highlights
Reinforced concrete structures may be considered permanent, they reveal pathological problems during their life span
Current test provides the experimental results of six concrete columns strengthened at different zones, tensile and compression surface, submitted to uniaxial compression
The strengthened columns PTS, PCS, PTSR and PCSR showed a similar behavior, with no evident deformations on the concrete original surface, which indicates that the concrete between the strengthening layers was not crushed
Summary
Reinforced concrete structures may be considered permanent, they reveal pathological problems during their life span. Certain pathologies are long-lasting in spite of unrelenting search for quality. Available methods for their prevention and correction still require improvements. Guimarães et al (2016) report that different types of pathologies may appear in the structure, which, in its turn, causes several problems and may even provoke ruptures. Greater loads than those calculated in the designing state, faults in the project, variations in humidity, corrosion processes in the reinforced concrete, intrinsic and extrinsic thermal variations to the concrete, biological agents and inadequate use of material, may cause pathological problems. In view of the relevance of the theme given the frequent demands for structural reinforcement in civil works, this research aims to contribute to the evaluation of the column strengthening and with the analysis of the experimental tests study the structural behavior and the efficiency of the partial jacketing of coated and non-
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